热带气象学报2012，Vol.28Issue(2)：187-196,10.DOI:10.3969/j.issn.1004-4965.2012.02.005
华南冬春降水的年际变化及其与水汽输送的联系
INTERANNUAL VARIABILITY OF WINTER AND SPRING PRECIPITATION IN SOUTH CHINA AND ITS RELATION TO MOISTURE TRANSPORT
摘要
Abstract
The interannual variability of winter and spring precipitation in SC and its relation to moisture transport are investigated by using the monthly precipitation data of National Meteorological Information Center (NMIC) and NCEP/NCAR reanalysis data from 1960 to 2008. The results show that winter and spring precipitation in SC is less than normal from the 1960s to the start of 1970s and from the end of 1990s to now. Most of rainfall anomalies on the regional scale of SC are well in phase during winter and spring and the frequency of persistent drought is more than that of persistent flood. Seasonal variations of the SC moisture transport differences between persistent drought and flood events are observed: the differences in winter are characterized by the moisture transport from the Bay of Bangle (BOB) and South China Sea (SCS), while differences in spring are characterized by that from SCS and North China (NC). There are two types of Nifio3.4 sea surface temperature anomaly (SSTA) that are related to persistent winter and spring drought (flood) events in SC; one is positive SSTA following Ni(n)o4 (Ni(n)o3) and the other is negative SSTA following Ni(n)o3 (Ni(n)o4). Moreover, the variations of moisture transport from BOB and SC have important effects on persistent drought/flood in SC with positive phase of Nino3.4 index, while that from western North Pacific-SC in winter and that from the Philippine Sea-SC and NC in spring primarily contribute to persistent drought/flood enevts in SC with negative phase of Ni(n)o3.4 index, and these stronger (weaker) moisture transports are observed in persistent flood (drought) during winter and spring regardless of the Nirlo3.4 index. In conclusion, with the correlation between the variations and distributions of Nino3.4 SSTA and persistent drought/flood events in SC, moisture transport is responsible for the formation of precipitation anomalies. In addition,the moisture transport from SCS is significantly correlated with persistent winter and spring drought/flood events.关键词
气候学/年际变化/EEOF分析/冬春降水/水汽输送/海温异常Key words
climatology/ interannual variability/ EEOF analysis/ winter and spring precipitation/ moisture transport/ sea surface temperature anomaly分类
天文与地球科学引用本文复制引用
吴蔚,温之平,陈运光,崔少萍..华南冬春降水的年际变化及其与水汽输送的联系[J].热带气象学报,2012,28(2):187-196,10.基金项目
国家自然科学基金重点项目(40730951) （40730951）
国家重点基础研究发展计划(2009CB421404) （2009CB421404）
国家自然科学基金委员会重大国际合作研究项目(40810059005)共同资助 （40810059005）
